Update sponsor tiers (#3453)

* Update readme

* Update template

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* Bronze test

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Author: colinhacks

.github/pull_request_template.md

@@ -1,8 +1,14 @@
-# Zod Pull Request
+<!--
 
-**IMPORTANT:** Development of the next major version of Zod (`v4`) is currently ongoing. If your PR implements new functionality, it should target the `v4` branch, NOT the `master` branch. (If it's a bugfix, the `master` branch is fine.)
+Development of the next major version of Zod (`v4`) is currently underway.
 
-## Overview
+If your PR implements new functionality, it should target the `v4` branch, NOT the `master` branch. If it's a bugfix, the `master` branch is fine.
+
+Thanks for your contribution!
+
+-->
+
+## {title}
 
 Thank you for your contribution to our project! Before submitting your pull request, please ensure the following: